mb/google/cyan: Clean up Kconfig

Cyan has no VGA BIOS available (at least not publicly), so
remove related options. Disable SoC serial output by default,
since no production devices have this exposed, but leave it
as a user option so it can be selected as needed (eg,
for use with a Google debug servo).

Change-Id: Ic079a39ca5ad0ac653b52248244b94d4bfbd08a4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39872
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/cyan/Kconfig

@@ -6,7 +6,6 @@ config BOARD_GOOGLE_BASEBOARD_CYAN
 	select EC_GOOGLE_CHROMEEC_LPC
 	select EC_GOOGLE_CHROMEEC_MEC
 	select EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
-	select ENABLE_BUILTIN_COM1
 	select HAVE_ACPI_TABLES
 	select HAVE_OPTION_TABLE
 	select INTEL_GMA_HAVE_VBT
@@ -73,23 +72,6 @@ config DEVICETREE
 	string
 	default "variants/$(CONFIG_VARIANT_DIR)/devicetree.cb"
 
-config VGA_BIOS_FILE
-	string
-	depends on VGA_BIOS
-	default "3rdparty/blobs/mainboard/intel/strago/vgabios.bin"
-	help
-	  The C0 version of the video BIOS gets computed from this name
-	  so that they can both be added.  Only the correct one for the
-	  system will be run.
-
-config VGA_BIOS_ID
-	string
-	depends on VGA_BIOS
-	default "8086,22b0"
-	help
-	  The VGA_BIOS_ID for the C0 version of the video BIOS is hardcoded
-	  in soc/intel/braswell/Makefile.inc as 8086,22b1
-
 config CBFS_SIZE
 	hex
 	default 0x200000
@@ -98,4 +80,10 @@ config MAINBOARD_SMBIOS_MANUFACTURER
 	string
 	default "GOOGLE"
 
+config CONSOLE_SERIAL
+	default n
+
+config ENABLE_BUILTIN_COM1
+	default y if CONSOLE_SERIAL
+
 endif # BOARD_GOOGLE_BASEBOARD_CYAN